<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/hhh/sel">
        用户名：<input type="text" name="username" />
        <input type="submit" />
        爱好：<input type="checkbox" name="hobby" value="swim">游泳
        <input type="checkbox" name="hobby" value="run"> 跑步
        <input type="checkbox" name="hobby" value="climb">爬山
    </form>
</body>
</html>